Vehicle roll bar unit



FIG. 1 is a perspective view from the rear of a vehicle roll bar unit,showing my new design;

FIG. 2 is a side elevational view thereof, a portion of a pick-up truckbed being indicated in broken lines for illustrative purposes only;

FIG. 3 is a bottom plan view thereof; and

FIG. 4 is a front elevational view thereof.

The ornamental design for a vehicle roll bar unit, substantially asshown.